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  • Devices designed to hold lenses in an appropriate position in front of the eyes. Lens types include corrective lenses, such as prescribed by an eye care specialist (ophthalmologist or optometrist) to assist vision (i.e., vision aids), eye protection (e.g., sunglasses), or nonfunctional for aesthetic purposes. Eyeglass frames are usually available in many colors and are made of metal or plastic or a composite material, such as graphite or titanium, with two arms that are supported by the ears; the arms are hinged at the wearer\'s temples. Usually, the nose pads that line the frames against the wearer\'s nose are adjustable for fit; in some eyeglass frames, the bridge that spans the top of the nose between the two lenses is also adjustable for fit.
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